155641693 has 2 divisors, whose sum is σ = 155641694. Its totient is φ = 155641692.

The previous prime is 155641679. The next prime is 155641697. The reversal of 155641693 is 396146551.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148766809 + 6874884 = 12197^2 + 2622^2 .

It is a cyclic number.

It is not a de Polignac number, because 155641693 - 2⁹ = 155641181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155641697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77820846 + 77820847.

It is an arithmetic number, because the mean of its divisors is an integer number (77820847).

Almost surely, 2^155641693 is an apocalyptic number.

It is an amenable number.

155641693 is a deficient number, since it is larger than the sum of its proper divisors (1).

155641693 is an equidigital number, since it uses as much as digits as its factorization.

155641693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 97200, while the sum is 40.

The square root of 155641693 is about 12475.6439913938. The cubic root of 155641693 is about 537.9087993719.

The spelling of 155641693 in words is "one hundred fifty-five million, six hundred forty-one thousand, six hundred ninety-three".